One thing I have learned to do in visiting various dojo in Japan is to focus on being respectful and polite when I go into a new dojo. You have to be aware and watch what the other people in the dojo are doing and strive to emulate their respectful behavior. Just going in and doing what you know is not enough. You have to work at being respectful and actively observe and figure out what is appropriate for the dojo you are in. It's not always easy, but it is necessary.